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/*
* lemonad - Some functional sweetness for Java
* Copyright (C) 2019 Pacien TRAN-GIRARD
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package org.pacien.lemonad.attempt;
import org.junit.jupiter.api.Test;
import java.util.NoSuchElementException;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.junit.jupiter.api.Assertions.fail;
/**
* @author pacien
*/
class AttemptTest {
@Test void testSimpleSuccess() {
var result = "result";
var success = Attempt.success(result);
assertFalse(success.isFailure());
assertTrue(success.isSuccess());
assertThrows(NoSuchElementException.class, success::getError);
assertEquals(result, success.getResult());
success.ifFailure(__ -> fail());
success.ifSuccess(innerResult -> assertEquals(result, innerResult));
}
@Test void testSimpleFailure() {
var error = 0;
var failure = Attempt.failure(error);
assertTrue(failure.isFailure());
assertFalse(failure.isSuccess());
assertEquals(error, failure.getError());
assertThrows(NoSuchElementException.class, failure::getResult);
failure.ifFailure(innerError -> assertEquals(error, innerError));
failure.ifSuccess(__ -> fail());
}
@Test void testNormalAttempt() {
var result = "result";
var success = Attempt.attempt(() -> result);
assertFalse(success.isFailure());
assertTrue(success.isSuccess());
assertThrows(NoSuchElementException.class, success::getError);
assertEquals(result, success.getResult());
success.ifFailure(__ -> fail());
success.ifSuccess(innerResult -> assertEquals(result, innerResult));
}
@Test void testFailedAttempt() {
var exception = new Exception();
var failure = Attempt.attempt(() -> {
throw exception;
});
assertTrue(failure.isFailure());
assertFalse(failure.isSuccess());
assertEquals(exception, failure.getError());
assertThrows(NoSuchElementException.class, failure::getResult);
failure.ifFailure(innerError -> assertEquals(exception, innerError));
failure.ifSuccess(__ -> fail());
}
@Test void testTransformationFlow() {
var result0 = 0;
var result1 = "res";
var result2 = 0L;
var result3 = "0";
var error0 = 0;
var error1 = 0L;
var error2 = "fail";
var error3 = false;
Attempt.<Integer, Long>success(result0)
.mapError((Long err) -> {
fail();
return Attempt.failure(err);
})
.mapResult((Integer res) -> Attempt.success(result1))
.mapResult((String res) -> {
assertEquals(result1, res);
return Attempt.<String, Integer>failure(error0);
}, (Integer err) -> {
assertEquals(error0, err);
return (long) err;
})
.ifSuccess((String __) -> fail())
.mapResult((String res) -> {
fail();
return Attempt.success(res);
})
.mapError((Long err) -> {
assertEquals(error0, err);
return Attempt.failure(error1);
})
.mapError((Long err) -> {
assertEquals(error1, err);
return Attempt.<Long, Long>success(result2);
}, (Long res) -> {
assertEquals(result2, res);
return res.toString();
})
.ifFailure((Long err) -> fail())
.flatMap((Attempt<? super String, ? super Long> attempt) -> {
assertEquals(Long.toString(result2), attempt.getResult());
return Attempt.<String, String>failure(error2);
})
.ifSuccess(__ -> fail())
.ifFailure(f -> assertEquals(error2, f))
.map((String __) -> Attempt.failure(error3), (String __) -> Attempt.success(result3))
.ifSuccess((String result) -> assertEquals(result3, result))
.ifFailure((Boolean __) -> fail());
}
}
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